Cage 9r636 is the oem
A structural shape fabricated from a ferrous or nonferrous material and has a flange extending usually at right angles in the same direction from each edge of a web and/or resembling the letter u in cross-sectional form.
NSN 6650-01-069-8211
NSN 6240-01-594-5006
NSN 5975-01-545-3708
NSN 5855-01-028-8387
NSN 5835-01-238-3381
NSN 6130-01-146-8474
NSN 6220-01-412-7650
NSN 5925-01-079-8416
NSN 6220-00-931-3299
NSN 5950-00-960-7021
NSN 5975-01-659-8953
NSN 5998-00-216-7436